public class Test05 {
    public static void main(String[] args) {
        int a = 3;
        a = a + 4;
        System.out.println(a);

        a += 4;
        System.out.println(a);
        //a += 4;相当于a = a + 4;
        //+=,-=,*=,/=,%= 这些操作符
        // 在代码执行速度上要略优于 +,-,*,/,%,但快的微乎其微
    }
}
